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参数资料
| 型号： | LTC4098EUDC#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/32页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER USB COMP 20-UTQFN |
| 标准包装： | 91 |
| 系列： | Bat-Track™, PowerPath™ |
| 功能： | 电源管理 |
| 电池化学： | 锂离子（Li-Ion）、锂聚合物（Li-Pol） |
| 电源电压： | 4.35 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-WFQFN 裸露焊盘 |
| 供应商设备封装： | 20-QFN-EP（3x4） |
| 包装： | 管件 |
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LTC4098/LTC4098-1
OPERATION
I VBUS(LIM) = I VBUSQ + ? CLPROG ? ? ( h CLPROG + 1 )
The switching input regulator can also be deactivated
(USB suspend).
The average input current will be limited by the CLPROG pro-
gramming resistor according to the following expression:
? V ?
? R CLPROG ?
where I VBUSQ is the quiescent current of the LTC4098/
LTC4098-1, V CLPROG is the CLPROG servo voltage in
current limit, R CLPROG is the value of the programming
resistor and h CLPROG is the ratio of the measured current
at V BUS to the sample current delivered to CLPROG. Refer
to the Electrical Characteristics table for values of h CLPROG ,
V CLPROG and I VBUSQ . Given worst-case circuit tolerances,
the USB specification for the average input current in 1x
or 5x mode will not be violated, provided that R CLPROG is
3.01k or greater.
Table 1 shows the available settings for the D0, D1 and
D2 pins.
Table 1. Controlled Input Current Limit
Notice that when D0 is high and D1 is low, the switching
regulator is set to a higher current limit for increased
charging and power availability at V OUT . These modes will
typically be used when there is line power available from
a wall adapter.
While not in current limit, the switching regulator’s
Bat-Track feature will set V OUT to approximately 300mV
above the voltage at BAT. However, if the voltage at BAT
is below 3.3V, and the load requirement does not cause
the switching regulator to exceed its current limit, V OUT
will regulate at a fixed 3.6V, as shown in Figure 2. This
instant-on operation will allow a portable product to run
immediately when power is applied without waiting for
the battery to charge.
If the load does exceed the current limit at V BUS , V OUT
will range between the no-load voltage and slighly below
the battery voltage, indicated by the shaded region of
Figure 2.
4.5
4.2
D2
0
D1
0
D0
0
CHARGER
STATUS I BUS(LIM)
On 100mA (1x)
3.9
3.6
NO LOAD
0
0
0
1
1
1
0
1
1
0
0
1
1
0
1
0
1
0
On 1A (10x)
On 500mA (5x)
Off 500μA (Susp Low)
Off 100mA (1x)
Off 1A (10x)
Off 500mA (5x)
3.3
3.0
2.7
2.4
300mV
1
1
1
Off 2.5mA (Susp High)
2.4
2.7
3.0
3.3
3.6
3.9
4.2
BAT (V)
40981 F02
Figure 2. V OUT vs BAT
40981fc
14
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相关代理商/技术参数 |
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| LTC4099 | 制造商:LINER 制造商全称:Linear Technology 功能描述:I2C Controlled USB Power Manager/Charger with Overvoltage Protection |
| LTC4099EPDC#PBF | 功能描述:IC USB PWR MANAGER/CHRGR 20UTQFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:PowerPath™ 标准包装:1 系列:- 功能:充电管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:3.75 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:剪切带 (CT) 产品目录页面:669 (CN2011-ZH PDF) 其它名称:MCP73831T-2ACI/OTCT |
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| LTC4099EPDC#TRPBF | 功能描述:IC USB PWR MANAGER/CHRGR 20UTQFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:PowerPath™ 标准包装:1 系列:- 功能:充电管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:3.75 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:剪切带 (CT) 产品目录页面:669 (CN2011-ZH PDF) 其它名称:MCP73831T-2ACI/OTCT |
| LTC4099EPDC-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:I2C Controlled USB Power Manager/Charger with Overvoltage Protection |
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